Replicate multiple schema

[rabbiveesh]

The docs are a bit deceptive on this; when doing start_sync and not specifying a schema, it picks public. This was surprising because the wording implied that it would copy all tables in the database it's connected to (not cluster, that's clear).

It would be nice to be able to replicate multiple schema at the same time, right now you have to start a bunch of separate groups and the docs show an example as to if you're meant to bootstrap before each group, though my experimenting seemed to show that bootstrapping agin just fails.